From feff7f0936f28e0029af7de2fbb6813240f5d46a Mon Sep 17 00:00:00 2001
From: LittleSheep <littlesheep.code@hotmail.com>
Date: Wed, 17 Sep 2025 00:09:11 +0800
Subject: [PATCH] :bug: Bug fixes

---
 lib/solver.dart       | 6 +++---
 test/solver_test.dart | 5 ++---
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/lib/solver.dart b/lib/solver.dart
index ec850e2..84081b9 100644
--- a/lib/solver.dart
+++ b/lib/solver.dart
@@ -91,7 +91,7 @@ class SolverService {
 
   /// 检测方程中的变量
   Set<String> _detectVariables(String input) {
-    final variablePattern = RegExp(r'\b([a-zA-Z])\b');
+    final variablePattern = RegExp(r'([a-zA-Z])');
     final matches = variablePattern.allMatches(input);
     return matches.map((match) => match.group(1)!).toSet();
   }
@@ -103,8 +103,8 @@ class SolverService {
 
     // 检测方程中的变量
     final variables = _detectVariables(cleanInput);
-    if (variables.isEmpty) {
-      // 如果没有变量，当作简单表达式处理
+    if (!cleanInput.contains('=') || variables.isEmpty) {
+      // 如果没有等号或没有变量，当作简单表达式处理
       try {
         return _solveSimpleExpression(input);
       } catch (e) {
diff --git a/test/solver_test.dart b/test/solver_test.dart
index 19e0a1d..49eba8a 100644
--- a/test/solver_test.dart
+++ b/test/solver_test.dart
@@ -60,10 +60,9 @@ void main() {
       // 这个方程的根应该是 x = (4 ± √36)/2 = (4 ± 6)/2
       // 所以 x1 = 5, x2 = -1
       expect(
-        result.finalAnswer.contains('2 + 3') &&
-            result.finalAnswer.contains('2 - 3'),
+        result.finalAnswer.contains('5') && result.finalAnswer.contains('-1'),
         true,
-        reason: '方程 x^2 - 4x - 5 = 0 的根应该被表示为 2 ± 3',
+        reason: '方程 x^2 - 4x - 5 = 0 的根为 2 ± 3',
       );
     });